agostar

To wither or scorch plants with intense heat (from agosto, August, historically the hottest, driest month) — el calor agostó los campos. Figuratively, it describes anything withering away or being destroyed, especially hopes, youth, or vitality, and shows up often in poetic/literary Spanish.

• La sequía agostó las cosechas de todo el valle. — The drought scorched the crops across the whole valley.
• Los años agostaron su antiguo entusiasmo. — The years withered away his old enthusiasm.
• El sol de julio agosta hasta la hierba más resistente. — The July sun scorches even the hardiest grass.

Using agostar for everyday wilting of a houseplant — it carries a stronger, often figurative or literary weight (searing destruction, not just a plant needing water); secarse is the plainer everyday verb for that.

• book En las orillas del Sar — Rosalía de Castro's 1884 poetry collection includes the line "la que ayer fue capullo, es rosa ya, y pronto agostará rosas y plantas el calor estival," using agostar for the summer heat withering roses and plants — one of Spanish poetry's classic images of fleeting beauty.